I am having some issues with using JBoss TreeCache in WebSphere due to the 
JBoss TreeCache dependency on JBoss JMX.  I know this isn't a WebSphere support 
group, but I though I would bring it up since you are targeting this library 
for portable use. 

WebSphere heavily uses JMX for administration and it will only accept its 
version of the javax.management API.  In my application I have setup the class 
loader hierarchy to load my application classes BEFORE the container classes 
(PARENT_LAST class loader mode).  Since JBoss Cache is in my class loader the 
JBoss JMX JARs will be the ones which are visible to my application.   I would 
like to register MBeans with the WAS MBean server, but I am prevented because I 
cant cast the WAS MBean server instance to the JBoss version of the JARs.

Also, I have considered moving the JBoss Cache up the class loader hierarchy to 
the container, but to do so I would have to unseal the WAS jmxc.jar and 
override it with the JBoss JMX implemenation as recommended by JBossCacheAndWAS 
Wiki.  I believe this would cause instability in the container at best and 
render the WAS MBean server useless at worst.

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